Starting off of a Mini-PCI Express library for KiCad.

So far includes;
 * Two KiCad PCB parts;
  * Mini-PCI Express Socket.
  * Mini-PCI Express "half size" card.
 * One KiCad schematic part;
  * Mini-PCI Express Socket.

Probably totally broken...

Working off of;
  PCI Express®
  Mini Card Electromechanical
  Specification
  Revision 1.2
  October 26, 2007
Merge remote-tracking branch 'origin/master'